Ohaus DEFENDER D500M MECHANICAL BENCH SCALE Manual - Manual (Page 7)

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OHAUS CORPORATION
7. Remove the plastic bubble from the beam shelf and beam assembly. Place the beam shelf upside down on the scale
platform. NOTE: Place some type of protection (i.e. carboard) on the scale platform to protect the platform and the beam
shelf from getting scratched.
8. Turn the beam assembly upside down and insert the rounded tip of the beam through the trig opening end of the beam
shelf assembly. To attach the beam assembly to the beam shelf, align the two holes in the plate of the beam assembly
with the two holes in welded plate, install and tighten the two screws # 10-32 x 3/8" (See Figure 5).
9. Place the hook onto the bottom end of the steelyard rod (refer to the exploded view diagram, Figure 2, for proper
positioning). Lift the assembled beam, turn it over, and attach the top of the steelyard rod through the stirrup on
the beam assembly.
10. Place the assembled beam with the steelyard rod over the column and tighten the column and the assembled beam
by inserting the hex head screws on both sides of the column. These screws should be finger-tightened only.
11. From underneath the column support plate, connect the hook that is on the steelyard rod under the pivot at the end
of the main lever of the scale base. Raising the tip of the main lever and some slight twisting of the hook by hand may
be required to get the hook under the pivot.
12. Be sure that the beam shelf is correctly leveled, and tighten the hex head screws (installed in step 10) firmly so as not
to allow any movement. NOTE: BE ALSO SURE THAT THE ROUNDED BEAM TIP IS CENTERED IN THE TRIG
OPENING (FRONT TO BACK) BEFORE TIGHTENING.
13. On the scale base, be sure that the four gold-colored fulcrum assemblies on the lever system are properly hooked
in the slot on the base flange.
14. Reinstall the spider assembly that was removed in step 3. Tilt the front end of the spider assembly, closest to the
column, downward slightly, for ease of reinstallation. The L-shaped bracket located in the center-front on the spider
assembly must be under the base flange; the heads of the two hex head bolts located in the center-front and center
back of the spider must both be inside of the base flange. Once installed, be sure that the four bearings are
properly seated on the four pivots of the main lever system.
15. Reinstall the scale platform removed in step 2.
16. Hook the load box assembly onto the stirrup located at the rounded end of the beam assembly, just inside of the trig
opening.
17. Adjust the scale to zero, if necessary. See Section V of this manual.
18. Place the counterpoise weights in the rack.
Welded Plate Beam Shelf
Zero Adjustment Screw
Beam
Assembly
Figure 5
# 10-32 x 3/8" screw
# 10-32 x 3/8" screw